Downloaded from https://www.everyspec.com AMP 70M N calibration, Mandatory recall means that the Individual instruments usually are trans- calibration laboratory is directed by project ported to a calibration laboratory for call- management to remove physically an in- bration at Intervals ranging from one to three strument, when due, from the test floor to months. A sticker must be applied to the the laboratory for calibration. To make such instrument to indicate the date calibrated and an operation practical, a loan pool of call- the date next due.
Floor inspection person- brated instruments must be available for re- nel have the responsibility of ensuring that placement of instruments removed. all instruments in use in their activity area are in calibration, If a loan pool of instru- Most large industrial firms and Government ments is available, the loan instruments should activities have their own calibration labor- be maintained in an in-calibration condition atories, Project test personnel must ensure and should be cycled into the laboratory for that the laboratory is advised early in the recalibration at the same intervals as instru.
project of any new (or more difficult) mena- ments in use on the floor, When individual surement requirements, so that additional instruments are part of' a complex test set-up standards can be procured and calibration which is In constant use, it is feasible'to procedures prepared and proofed out in time calibrate only the scales on the instruments to support these now measurements. which are actually used in the set-up, pro- vided that the instruments are marked as In smaller companies and activities, how- being usable only 'on those particular scales. ever, calibration laboratories are not usually economically feasible.
These activities must With large fixed instruments, or with de- use the services of commercial calibration licate moving coil instruments used for highly laboratories. They should do so with great accurate misurements, it may be necessary care, however, because many commercial for calibration personnel to carry fixed stan- companies do not have adequate calibration dards from the calibration laboratories to the facilities. When no suitable commercial instrument into the laboratory, If this is calibration laboratory is available it a local necessary, optimum working conditions.
area, arrangements should be made with the should be provided in the work area to en- nearest Department of Defense industrial sure maximum accuracy. facility to perform instrument (or stan- dards) calibration, Calibration of complex measuring and en.- vironmental systems usually is performed In- i- The Standards Laboratory Information place, although some consoles may be trans- Manual, published by the Department of the ported to the calibration laboratory.
The Navy, Bureau of Naval Weapons, Pomona, calibration should be performed at the test California, presents a complete treatise on leads or at the point of application of the calibration and standards laboratories (Ref, environment so that the edrrors introduced by I). This manual includes recommended cabling and switching or by the input fixtures recalibration frequencies for a large list of of environmental equipment will be detected commercial measuring equipment. Three in the calibration process. For control pur- basic kinds of calibration are discussed:
(1) poses, doors, panels, and removable instrvi- calibration of Individual instruments, such as ments and equipments should be sealed and moteos, gages, and power supplies; (2) call- break-of-inspection procedures established to bratlon of systems of complex test or en- ensure that any' changes or tampering will be vironmental equipment; and (3) calibration detected and recalibration performed. The of standards. recalibration interval of' complex equipmmit t ' ' ! ., :.... ,, 0'. ' . •- , .,*-.'",,